GD25LQ128CSIS / GigaDevice Semiconductor (Beijing) Inc.

GD25LQ128CSIS Datasheet with Chat AI

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# Example questions: ➢ Explain how the block protect (bp4-bp0) bits, in conjunction with the cmp bit, control memory protection. referencing table 1, describe a scenario where the chip erase command *would* be executed.
➢ What is the purpose of the wel (write enable latch) bit in the status register, and what conditions must be met to enable writing to the device?
➢ Describe the function of the qe (quad enable) bit and what considerations should be taken when setting it to '1'. why might it be best to leave it at its default setting?

Part No.	GD25LQ128CSIS
Manufacturer	GIGADEVICE
Size	1Mb
Pages	73 pages
Description	1.8V Uniform Sector Dual and Quad Serial Flash

Datasheet Summary with AI

1. Memory Organization & General Operations

️· Capacity: 128 Mbit (16MB)
️· Quad Mode: Allows faster read operations using four I/O pins. Enabled by setting the `QE` bit in the Status Register (S9).
️· Command Set: Supports standard Flash memory commands like Read, Write, Erase, and Status Register operations.
️· Fast Read: Quad mode is available.
️· Suspending/Resuming: Supports Program/Erase Suspend/Resume to allow other operations.

2. Command Modes & Features

️· Write in Progress (WIP): Indicates whether a program, erase, or status register write is currently in progress.
️· Write Enable (WEL): Controls the ability to write to the status register or program/erase data.
️· Program/Erase Suspend (75H): Suspending program or erase operations. Sets `SUS1` bit in status register to '1'.
️· Program/Erase Resume (7AH): Resuming program or erase operations. Clears both `SUS1` and `SUS2` bits.

3. Status Register Details (S15-S0)

️· SUS1 (S15): Set by Program Suspend.
️· CMP (S14): Used with Block Protect bits (BP4-BP0) for defining protection areas.
️· LB3, LB2, LB1 (S13-S11): One-Time Programmable bits for controlling access to Security Registers. Once set to '1', those registers become read-only.
️· SRP1, SRP0 (S10-S9): Control the write protection method:
- Software Protection (0, 0): Normal operation.
- Hardware Protection (0, 1): Protected by WP# pin.
- Hardware Unprotected (0, 1, WP#=1): Writable.
- Power Supply Lock-Down (1, 0): Protected until power cycle.
- One-Time Programmable (1, 1): Permanently protected.
️· QE (S9): Quad Enable bit. (0 = default, WP# and HOLD# enable)
️· WEL (S1): Write Enable Latch.
️· WIP (S0): Write in Progress.

4. Protection Mechanisms

️· Block Protect (BP4-BP0): Non-volatile bits defining protected areas. Combined with `CMP` for more flexible protection.
️· Hardware Protection: Controlled by external WP# (Write Protect) pin.
️· Software Protection: controlled by SRP1 and SRP0 bits.
️· One-Time Programmable (OTP) Protection: Permanent protection of the Status Register, controlled by the `LB3`, `LB2`, `LB1` bits.
️· Security Registers: Protected by OTP bits.